use nixos-unstable

Author: pepeiborra

nix/sources.json

@@ -12,15 +12,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-19.09",
+        "branch": "nixpkgs-unstable",
         "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs-channels",
-        "rev": "289466dd6a11c65a7de4a954d6ebf66c1ad07652",
-        "sha256": "0r5ja052s86fr54fm1zlhld3fwawz2w1d1gd6vbvpjrpjfyajibn",
+        "rev": "b8c367a7bd05e3a514c2b057c09223c74804a21b",
+        "sha256": "0y17zxhwdw0afml2bwkmhvkymd9fv242hksl3l3xz82gmlg1zks4",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/289466dd6a11c65a7de4a954d6ebf66c1ad07652.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/b8c367a7bd05e3a514c2b057c09223c74804a21b.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }